Java Get substring of a string

Question

I have 2 strings as shown below:

String paramNum = "99999256";
String opCode = "99999";

On the String paramNum I want to extract that part of the string which appears after the string value contained in opCode

So with the above example: the result should be "99999256" - "99999" = "256". Parse paramNum (99999256) and reach to a position of after 99999 and then do a substring till end of the string. But I am not sure on how to reach to that position?

Note this is only a symbolic representation of what I want to do with these strings and they do mean a subtraction on 2 int.

Maroun · Accepted Answer · 2014-11-18 09:35:23Z

5

One way of 100+ possible ways:

String res = paramNum.replace(opCode,"");

Visit the String API to fuel your creative fire.

If you want to replace only first match, you can:

String res = paramNum.replaceFirst(opCode,"");

answered Nov 18, 2014 at 9:35

Maroun

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6 Comments

Ker p pag Over a year ago

probably easiest of 'em all.

Robby Cornelissen Over a year ago

Tricky because if opCode appears multiple times in the string, all occurrences will be replaced.

Adam Over a year ago

What if 99999 appears in the second half?

Dmitry Ginzburg Over a year ago

With replaceFirst you should use Pattern.quote just in case opCode would contain smth like a+b+c

Maroun Over a year ago

@DmitryGinzburg Indeed. I think my answer guides OP enough. He can easily investigate and learn from here.

|

M A · Accepted Answer · 2014-11-18 09:37:45Z

1

Using String#substring:

int indexOfOpCode = paramNum.indexOf(opCode);
if(indexOfOpCode != -1) {
    String extractedStr = paramNum.substring(indexOfOpCode + opCode.length());
    ...
}

answered Nov 18, 2014 at 9:37

M A

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1 Comment

jhamon Over a year ago

or use StringUtils.substringAfter

Arun · Accepted Answer · 2014-11-18 09:53:57Z

0

I came with the below:

if (paramNum.startsWith(opCode)) { // This can be - if (paramNum.contains(opCode)) {
   String res = paramNum.substring(opCode.length(), paramNum.length());
}

Note that for my case the string that I want to find always appears at the beginning...

answered Nov 18, 2014 at 9:53

Arun

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Comments

Mudit Saklani · Accepted Answer · 2014-11-18 10:28:28Z

0

One of the way:

String opcode;

String res= paranum.replaceAll(opcode," ");

Will replace all the occurrence of opcode string with space...whereas in place of opcode you can also give regular expression as a string...

edited Nov 18, 2014 at 10:28

answered Nov 18, 2014 at 9:55

Mudit Saklani

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